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  1. They have not been understood the problem till now.
  2. They have not been understanding the problem till now.

Which of this is correct?

I think I can't use 'understanding' because 'to understand' can't be in process. But if I go by the present perfect continuous form understanding is the correct usage.

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    Normally "They have not understood the problem until now".
    – Peter
    Nov 6, 2021 at 9:12
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    (1) is grammatically incorrect. (2) is not idiomatic because we don't use understand in the continuous tense. Peter's version is the correct one. Nov 6, 2021 at 9:34
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    Understand is a stative verb and so it is not normally used in continuous tenses in British or American Engish. Stative verbs are used in continuous tenses in Indian English. Here's the British take on stative verbs: learnenglish.britishcouncil.org/grammar/…
    – JavaLatte
    Nov 6, 2021 at 10:05
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    if the examples were supposed to be in the passive voice then it's "THE PROBLEM has not been understood [by them] until now
    – Mari-Lou A
    Nov 7, 2021 at 12:54

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